Update: SpaceX has joined the open source open letter signing, Anthropic is still absent

Comparative news, according to monitoring, Nvidia, Microsoft, Meta and other companies jointly issued an open letter “Open Weights and American AI Leadership” to continue expanding. The number of signatories has increased from the initial 25 to 77. Among them, SpaceX received the most attention. Musk previously only retweeted Hwang In-hoon's post on X, saying he fully supports it; Jensen was right. The company didn't sign up at the time, and now SpaceX is officially on the list. The letter asks the US government not to prematurely restrict open weight models that can be downloaded and self-deployed, and to treat normal distillation differently from illegal extraction. Anthropic still hasn't signed.